To the OP, I feel feel your pain. This happened to me 11 yrs ago, I lost my barn/ shop to a fire, including a 1968 Chevelle SS 396 that I was restoring. As others have said, automobiles are not covered by homeowners insurance. I had collector car insurance, so all good there. A few words of advice to those of you that have garages/shops:
1. Review your insurance, make sure you are adequately covered.
2. Are your contents insured for replacement value? If not, insurance company will depreciate the contents and give you that value!
3. Take pictures or videos of your contents. This helps in two ways. It serves as a reminder of what was lost and proves what you lost to the insurance company. I had pictures of all my tools and other contents. The replacement process went seamlessly.
4. Store your flammable liquids in a safe manner. This was the cause of my fire.